jQuery Ajax函数

 函数：$.ajax(properties)

功能：用一个http请求访问一个远程页面
返回：XMLHttpRequest

参数；
(String)url请求地址，
(String)type请求类型("GET","POST")
(String)dataType:从服务器端返回的数据类型("xml","html","script","json")
(Boolean)ifModified:根据Last-Modified header判断返回内容是否改变
(Number)timeout：请求超时
(Boolean)global:对此次请求是否引起全局的ajax事件出来，默认true
(Function)error:错误处理函数
(Function)complete:请求完成后的处理函数
(Object|String)data:发送到服务器端的数据
(String) contentType ：默认"application/x-www-form-urlencoded"
(Boolean) processData ：传输到服务器端的数据默认被转换到query string中以适合默认"application/x-www-form-urlencoded"

方式，如果你想以DOMDocuments方式传输数据，就将该选项设为false
(Boolean)aysnc:是否异步传输，默认为true
(Function)beforeSend:请求前响应函数

例子：
Load and execute a JavaScript file.
[CODE=javascript]$.ajax({
type: "GET",
url: "test.js",
dataType: "script"
});[/CODE]
Save some data to the server and notify the user once its complete.
[CODE=javascript]$.ajax({
type: "POST",
url: "some.php",
data: "name=John&location=Boston",
success: function(msg){
alert( "Data Saved: " + msg );
}
});[/CODE]
jQuery Code
[CODE=javascript]var html = $.ajax({
url: "some.php",
async: false
}).responseText;[/CODE]
jQuery Code
[CODE=javascript]var xmlDocument = [create xml document];
$.ajax({
url: "page.php",
processData: false,
data: xmlDocument,
success: handleResponse
});[/CODE]
函数：$.ajaxSetup(settings),$.ajaxTimeout(time)
功能：设定请求的一些参数
返回:undefined

例子：
[CODE=javascript]$.ajaxSetup( {
url: "/xmlhttp/",
global: false,
type: "POST"
});
$.ajaxTimeout( 5000 );
[/CODE]
函数：$.get(url, params, callback),$.getIfModified(url, params, callback),
$.getJSON(url, params, callback),$.getScript(url, callback)

功能：get方式提交数据

例子：
[CODE=javascript]$.get("test.cgi",
{ name: "John", time: "2pm" },
function(data){
alert("Data Loaded: " + data);
}
);[/CODE]
函数：$.post(url, params, callback)
功能：post方式提交数据

例子：
[CODE=javascript]$.post("test.cgi",
{ name: "John", time: "2pm" },
function(data){
alert("Data Loaded: " + data);
}
);[/CODE]
函数：ajaxComplete(callback),ajaxComplete(callback),ajaxSend(callback)
ajaxStart(callback),ajaxStop(callback),ajaxSuccess(callback)

功能：XMLHttpRequest状态改变过程中各个响应处理函数

例子：
[CODE=javascript]$("#msg").ajaxComplete(function(request, settings){
$(this).append("

Request Complete.

");
});

$("#msg").ajaxSuccess(function(request, settings){
$(this).append("

Successful Request!

");
});

$("#loading").ajaxStop(function(){
$(this).hide();
});

$("#msg").ajaxSend(function(request, settings){
$(this).append("

Starting request at " + settings.url + "

");
});[/CODE]
函数：load(url, params, callback),loadIfModified(url, params, callback)

功能：加载html内容
返回：jQuery对象
参数：同get和post方式提交

例子：
$("#feeds").load("feeds.html");
Before

Result:

45 feeds found.

[CODE=javascript]$("#feeds").load("feeds.html",
{limit: 25},
function() { alert("The last 25 entries in the feed have been loaded"); }
);[/CODE]
函数：serialize()

功能：将表单元素和值序列化成string
返回：String

例子：
$("input[@type=text]").serialize();
Before

Result
name=John&location=Boston